Schneider Electric VW3 A3 303 用户手册
43
9. 5. 2-wire Jbus schematic
Schematic diagram:
Type of trunk cable
Cable with 1 shielded twisted pair
Maximum length of bus
1,300 m at 19200 bps
Maximum number of stations (without
repeater)
repeater)
32 stations, i.e., 31 slaves
Maximum length of tap links
3 m
Bus polarization
One 470
Ω pull-up resistor to the 5 V
One 470
Ω pull-down resistor to the 0 V
This polarization is often provided in the master.
Line termination
One 150
Ω resistor
Common polarity
No
470
Ω
470
Ω
150
Ω
150
Ω
5 V
0 V
G
R
G
R
G
R
L- (B/B')
L+ (A/A')
Master
Slave 1
Slave n